package app

import (
	"context"
	"crypto/rsa"
	"crypto/x509"
	"encoding/base64"
	"encoding/pem"
	"errors"
	"fmt"
	"math"
	"net"
	"net/url"
	"os"
	"path/filepath"
	"strconv"
	"strings"
	"time"

	"git.5iot.com/iotlcm-public/iotlcm-app/internal/consts"
	"git.5iot.com/iotlcm-public/iotlcm-app/internal/dao"
	"git.5iot.com/iotlcm-public/iotlcm-app/internal/model/entity"

	"github.com/gogf/gf/v2/errors/gerror"
	"github.com/gogf/gf/v2/frame/g"
	"github.com/gogf/gf/v2/os/gtime"
	"github.com/wechatpay-apiv3/wechatpay-go/core"
	"github.com/wechatpay-apiv3/wechatpay-go/core/auth"
	"github.com/wechatpay-apiv3/wechatpay-go/core/auth/verifiers"
	"github.com/wechatpay-apiv3/wechatpay-go/core/notify"
	"github.com/wechatpay-apiv3/wechatpay-go/core/option"
	"github.com/wechatpay-apiv3/wechatpay-go/services/payments"
	"github.com/wechatpay-apiv3/wechatpay-go/services/payments/h5"
	"github.com/wechatpay-apiv3/wechatpay-go/services/payments/jsapi"
	"github.com/wechatpay-apiv3/wechatpay-go/services/refunddomestic"
)

const (
	appWechatPayMethodH5   = "wechat_h5"
	appWechatPayMethodMini = "wechat_mini"
	appWechatNotifyPath    = "/api/v1/payment/wechat/notify"
	appWechatRefundPath    = "/api/v1/payment/wechat/refund-notify"
)

type appWechatConfig struct {
	Enabled               bool                `json:"enabled"`
	EnvFile               string              `json:"envFile"`
	ApiBase               string              `json:"apiBase"`
	MchId                 string              `json:"mchId"`
	MchSerialNo           string              `json:"mchSerialNo"`
	ApiV3Key              string              `json:"apiV3Key"`
	PrivateKeyPath        string              `json:"privateKeyPath"`
	PrivateKey            string              `json:"privateKey"`
	NotifyUrl             string              `json:"notifyUrl"`
	NotifyBaseUrl         string              `json:"notifyBaseUrl"`
	RefundNotifyUrl       string              `json:"refundNotifyUrl"`
	TimeoutMinutes        int                 `json:"timeoutMinutes"`
	PlatformPublicKeyId   string              `json:"platformPublicKeyId"`
	PlatformPublicKeyPath string              `json:"platformPublicKeyPath"`
	PlatformPublicKey     string              `json:"platformPublicKey"`
	H5                    appWechatH5Config   `json:"h5"`
	Mini                  appWechatMiniConfig `json:"mini"`
}

type appWechatH5Config struct {
	Enabled       bool   `json:"enabled"`
	AppId         string `json:"appId"`
	AppName       string `json:"appName"`
	AppUrl        string `json:"appUrl"`
	PayerClientIp string `json:"payerClientIp"`
}

type appWechatMiniConfig struct {
	Enabled   bool   `json:"enabled"`
	AppId     string `json:"appId"`
	AppSecret string `json:"appSecret"`
}

type appWechatPayRequest struct {
	PayUrl    string
	PayMethod string
	PayParams map[string]string
}

func appWechatPayUrl(payRequest *appWechatPayRequest) string {
	if payRequest == nil {
		return ""
	}
	return payRequest.PayUrl
}

func appWechatPayMethod(payRequest *appWechatPayRequest) string {
	if payRequest == nil {
		return ""
	}
	return payRequest.PayMethod
}

func appWechatPayParams(payRequest *appWechatPayRequest) map[string]string {
	if payRequest == nil || len(payRequest.PayParams) == 0 {
		return nil
	}
	copied := make(map[string]string, len(payRequest.PayParams))
	for key, value := range payRequest.PayParams {
		copied[key] = value
	}
	return copied
}

func appLoadWechatConfig(ctx context.Context) (*appWechatConfig, error) {
	cfg := &appWechatConfig{}
	if err := g.Cfg().MustGet(ctx, "payment.wechat").Scan(cfg); err != nil {
		return nil, gerror.Wrap(err, "读取微信支付配置失败")
	}

	envDir, err := appLoadWechatEnvFile(ctx, cfg.EnvFile)
	if err != nil {
		return nil, err
	}
	appApplyWechatEnvOverrides(cfg, envDir)
	appNormalizeWechatConfig(cfg)
	return cfg, nil
}

func appLoadWechatEnvFile(ctx context.Context, configured string) (string, error) {
	envFile := strings.TrimSpace(os.Getenv("WECHAT_PAY_ENV_FILE"))
	if envFile == "" {
		envFile = strings.TrimSpace(configured)
	}
	if envFile == "" {
		return "", nil
	}

	absPath, err := filepath.Abs(filepath.Clean(envFile))
	if err != nil {
		return "", gerror.Wrap(err, "解析微信支付环境配置路径失败")
	}
	data, err := os.ReadFile(absPath)
	if errors.Is(err, os.ErrNotExist) {
		g.Log().Warningf(ctx, "微信支付环境配置文件不存在，将继续读取系统环境变量: %s", absPath)
		return filepath.Dir(absPath), nil
	}
	if err != nil {
		return filepath.Dir(absPath), gerror.Wrap(err, "读取微信支付环境配置失败")
	}

	values := appParseDotenv(string(data))
	for key, value := range values {

		if _, exists := os.LookupEnv(key); exists {
			continue
		}
		if err = os.Setenv(key, value); err != nil {
			return filepath.Dir(absPath), gerror.Wrapf(err, "写入微信支付环境变量失败: %s", key)
		}
	}
	g.Log().Debugf(ctx, "微信支付环境配置已加载: %s", absPath)
	return filepath.Dir(absPath), nil
}

func appParseDotenv(content string) map[string]string {
	result := make(map[string]string)
	content = strings.TrimPrefix(content, "\ufeff")
	for _, line := range strings.Split(content, "\n") {
		line = strings.TrimSpace(strings.TrimRight(line, "\r"))
		if line == "" || strings.HasPrefix(line, "#") {
			continue
		}
		index := strings.Index(line, "=")
		if index <= 0 {
			continue
		}
		key := strings.TrimSpace(line[:index])
		value := strings.TrimSpace(line[index+1:])
		value = strings.Trim(value, `"'`)
		if key != "" {
			result[key] = value
		}
	}
	return result
}

func appApplyWechatEnvOverrides(cfg *appWechatConfig, envDir string) {
	cfg.Enabled = appEnvBool("WECHAT_PAY_ENABLED", cfg.Enabled)
	cfg.H5.Enabled = appEnvBool("WECHAT_PAY_H5_ENABLED", cfg.H5.Enabled)
	cfg.Mini.Enabled = appEnvBool("WECHAT_PAY_MINI_ENABLED", cfg.Mini.Enabled)

	cfg.MchId = appEnvValue("WECHAT_PAY_MCH_ID", cfg.MchId)
	cfg.MchSerialNo = appEnvValue("WECHAT_PAY_MCH_SERIAL_NO", cfg.MchSerialNo)
	cfg.ApiV3Key = appEnvValue("WECHAT_PAY_API_V3_KEY", cfg.ApiV3Key)
	cfg.PrivateKey = appEnvValue("WECHAT_PAY_MCH_PRIVATE_KEY", cfg.PrivateKey)
	cfg.PrivateKeyPath = appEnvPath("WECHAT_PAY_MCH_PRIVATE_KEY_PATH", cfg.PrivateKeyPath, envDir)
	cfg.PlatformPublicKey = appEnvValue("WECHAT_PAY_PUBLIC_KEY", cfg.PlatformPublicKey)
	cfg.PlatformPublicKeyId = appEnvValue("WECHAT_PAY_PUBLIC_KEY_ID", cfg.PlatformPublicKeyId)
	cfg.PlatformPublicKeyPath = appEnvPath("WECHAT_PAY_PUBLIC_KEY_PATH", cfg.PlatformPublicKeyPath, envDir)
	cfg.NotifyUrl = appEnvValue("WECHAT_PAY_NOTIFY_URL", cfg.NotifyUrl)
	cfg.NotifyBaseUrl = appEnvValue("WECHAT_PAY_NOTIFY_BASE_URL", cfg.NotifyBaseUrl)
	cfg.RefundNotifyUrl = appEnvValue("WECHAT_PAY_REFUND_NOTIFY_URL", cfg.RefundNotifyUrl)

	if timeout := strings.TrimSpace(os.Getenv("WECHAT_PAY_TIMEOUT_MINUTES")); timeout != "" {
		if value, err := strconv.Atoi(timeout); err == nil {
			cfg.TimeoutMinutes = value
		}
	}

	// AppID 优先使用本项目配置，避免模板 .env 中的旧 AppID 覆盖当前小程序配置。
	if value := appEnvFirst("APP_WECHAT_H5_APP_ID", "WECHAT_PAY_H5_APP_ID"); value != "" {
		cfg.H5.AppId = value
	} else if cfg.H5.AppId == "" {
		cfg.H5.AppId = appEnvFirst("WECHAT_PAY_SERVICE_APP_ID", "WECHAT_PAY_APP_ID")
	}
	cfg.H5.AppName = appEnvValue("WECHAT_PAY_H5_APP_NAME", cfg.H5.AppName)
	cfg.H5.AppUrl = appEnvValue("WECHAT_PAY_H5_APP_URL", cfg.H5.AppUrl)
	cfg.H5.PayerClientIp = appEnvValue("WECHAT_PAY_H5_PAYER_CLIENT_IP", cfg.H5.PayerClientIp)

	if value := appEnvFirst("APP_WECHAT_MINI_APP_ID", "WECHAT_PAY_MINI_APP_ID"); value != "" {
		cfg.Mini.AppId = value
	} else if cfg.Mini.AppId == "" {
		cfg.Mini.AppId = strings.TrimSpace(os.Getenv("WECHAT_PAY_MINI_PROGRAM_APP_ID"))
	}
	if value := appEnvFirst("APP_WECHAT_MINI_APP_SECRET", "WECHAT_MINI_APP_SECRET", "WECHAT_PAY_MINI_APP_SECRET", "WECHAT_PAY_MINI_PROGRAM_APP_SECRET"); value != "" {
		cfg.Mini.AppSecret = value
	}
}

func appNormalizeWechatConfig(cfg *appWechatConfig) {
	cfg.EnvFile = strings.TrimSpace(cfg.EnvFile)
	cfg.ApiBase = strings.TrimRight(strings.TrimSpace(cfg.ApiBase), "/")
	cfg.MchId = strings.TrimSpace(cfg.MchId)
	cfg.MchSerialNo = strings.TrimSpace(cfg.MchSerialNo)
	cfg.ApiV3Key = strings.TrimSpace(cfg.ApiV3Key)
	cfg.PrivateKeyPath = strings.TrimSpace(cfg.PrivateKeyPath)
	cfg.PrivateKey = strings.TrimSpace(cfg.PrivateKey)
	cfg.NotifyUrl = strings.TrimSpace(cfg.NotifyUrl)
	cfg.NotifyBaseUrl = strings.TrimSpace(cfg.NotifyBaseUrl)
	cfg.RefundNotifyUrl = strings.TrimSpace(cfg.RefundNotifyUrl)
	cfg.PlatformPublicKeyId = strings.TrimSpace(cfg.PlatformPublicKeyId)
	cfg.PlatformPublicKeyPath = strings.TrimSpace(cfg.PlatformPublicKeyPath)
	cfg.PlatformPublicKey = strings.TrimSpace(cfg.PlatformPublicKey)
	cfg.H5.AppId = strings.TrimSpace(cfg.H5.AppId)
	cfg.H5.AppName = strings.TrimSpace(cfg.H5.AppName)
	cfg.H5.AppUrl = strings.TrimSpace(cfg.H5.AppUrl)
	cfg.H5.PayerClientIp = strings.TrimSpace(cfg.H5.PayerClientIp)
	cfg.Mini.AppId = strings.TrimSpace(cfg.Mini.AppId)
	cfg.Mini.AppSecret = strings.TrimSpace(cfg.Mini.AppSecret)

	if cfg.ApiBase == "" {
		cfg.ApiBase = "https://api.mch.weixin.qq.com"
	}
	if cfg.TimeoutMinutes <= 0 {
		cfg.TimeoutMinutes = 5
	}
	if cfg.NotifyBaseUrl != "" {
		cfg.NotifyUrl = appWechatBuildNotifyUrl(cfg.NotifyBaseUrl)
		if cfg.RefundNotifyUrl == "" {
			cfg.RefundNotifyUrl = appWechatBuildUrl(cfg.NotifyBaseUrl, appWechatRefundPath)
		}
	} else {
		cfg.NotifyUrl = appWechatNormalizeNotifyUrl(cfg.NotifyUrl)
	}
	if cfg.RefundNotifyUrl != "" {
		cfg.RefundNotifyUrl = appWechatNormalizePathUrl(cfg.RefundNotifyUrl, appWechatRefundPath)
	}
}

func appEnvValue(key string, current string) string {
	if value := strings.TrimSpace(os.Getenv(key)); value != "" {
		return value
	}
	return current
}

func appEnvFirst(keys ...string) string {
	for _, key := range keys {
		if value := strings.TrimSpace(os.Getenv(key)); value != "" {
			return value
		}
	}
	return ""
}

func appEnvBool(key string, current bool) bool {
	value := strings.TrimSpace(os.Getenv(key))
	if value == "" {
		return current
	}
	switch strings.ToLower(value) {
	case "1", "true", "yes", "y", "on", "enabled":
		return true
	case "0", "false", "no", "n", "off", "disabled":
		return false
	default:
		return current
	}
}

func appEnvPath(key string, current string, envDir string) string {
	value := strings.TrimSpace(os.Getenv(key))
	if value == "" {
		return current
	}
	if filepath.IsAbs(value) || envDir == "" {
		return value
	}
	return filepath.Join(envDir, value)
}

func appWechatBuildNotifyUrl(base string) string {
	return appWechatBuildUrl(base, appWechatNotifyPath)
}

func appWechatBuildUrl(base string, path string) string {
	base = strings.TrimSpace(base)
	if base == "" {
		return ""
	}
	parsed, err := url.Parse(base)
	if err != nil || parsed.Scheme == "" || parsed.Host == "" {
		return strings.TrimRight(base, "/") + path
	}
	parsed.Path = path
	parsed.RawPath = ""
	parsed.RawQuery = ""
	parsed.Fragment = ""
	return parsed.String()
}

func appWechatNormalizeNotifyUrl(raw string) string {
	return appWechatNormalizePathUrl(raw, appWechatNotifyPath)
}

func appWechatNormalizePathUrl(raw string, path string) string {
	raw = strings.TrimSpace(raw)
	if raw == "" {
		return ""
	}
	parsed, err := url.Parse(raw)
	if err != nil || parsed.Scheme == "" || parsed.Host == "" {
		return raw
	}
	if strings.TrimSpace(parsed.Path) == "" || strings.TrimRight(parsed.Path, "/") == strings.TrimRight(path, "/") {
		parsed.Path = path
		parsed.RawPath = ""
		parsed.RawQuery = ""
		parsed.Fragment = ""
		return parsed.String()
	}
	return raw
}

func appWechatEnabled(ctx context.Context) bool {
	cfg, err := appLoadWechatConfig(ctx)
	return err == nil && cfg.Enabled
}

func appWechatPaymentTimeoutDuration(ctx context.Context) time.Duration {
	minutes := g.Cfg().MustGet(ctx, "payment.wechat.timeoutMinutes", 5).Int()
	if timeout := strings.TrimSpace(os.Getenv("WECHAT_PAY_TIMEOUT_MINUTES")); timeout != "" {
		if value, err := strconv.Atoi(timeout); err == nil {
			minutes = value
		}
	}
	if minutes <= 0 {
		minutes = 5
	}
	return time.Duration(minutes) * time.Minute
}

func appBalanceRechargePaymentTiming(ctx context.Context, order *entity.TOrder) (*gtime.Time, int64, bool) {
	if order == nil || order.OrderType != consts.OrderTypeBalanceRecharge || order.PayStatus != consts.PayStatusUnpaid {
		return nil, 0, false
	}
	if order.CreatedAt == nil || order.CreatedAt.IsZero() {
		return nil, 0, false
	}

	expireAt := order.CreatedAt.Add(appWechatPaymentTimeoutDuration(ctx))
	remaining := expireAt.Sub(gtime.Now())
	if remaining <= 0 {
		return expireAt, 0, true
	}
	return expireAt, int64(math.Ceil(remaining.Seconds())), false
}

func appWechatPrepayExpireTime(ctx context.Context, cfg *appWechatConfig, order *entity.TOrder) time.Time {
	timeout := appWechatPaymentTimeoutDuration(ctx)
	if cfg != nil && cfg.TimeoutMinutes > 0 {
		timeout = time.Duration(cfg.TimeoutMinutes) * time.Minute
	}
	if order != nil && order.CreatedAt != nil && !order.CreatedAt.IsZero() {
		return time.Unix(order.CreatedAt.Add(timeout).Timestamp(), 0)
	}
	return time.Now().Add(timeout)
}

func appMockPaymentEnabled(ctx context.Context) bool {
	return g.Cfg().MustGet(ctx, "payment.mock.enabled", false).Bool()
}

func appBuildWechatPayRequest(ctx context.Context, order *entity.TOrder, payScene string, user *entity.SysUser) (*appWechatPayRequest, error) {
	if order == nil || strings.TrimSpace(order.OrderSn) == "" {
		return nil, gerror.New("微信支付下单订单信息不完整")
	}
	cfg, err := appLoadWechatConfig(ctx)
	if err != nil {
		return nil, err
	}
	if !cfg.Enabled {
		return nil, nil
	}
	if err = appValidateWechatCommonConfig(cfg); err != nil {
		return nil, err
	}
	if _, _, expired := appBalanceRechargePaymentTiming(ctx, order); expired {
		return nil, gerror.New("支付订单已过期，请重新提交充值")
	}

	switch appNormalizeWechatPayScene(payScene) {
	case "mini":
		return appBuildWechatMiniPayRequest(ctx, cfg, order, user)
	default:
		return appBuildWechatH5PayRequest(ctx, cfg, order)
	}
}

func appValidateWechatCommonConfig(cfg *appWechatConfig) error {
	if cfg.MchId == "" {
		return gerror.New("微信支付商户号未配置")
	}
	if cfg.MchSerialNo == "" {
		return gerror.New("微信支付商户证书序列号未配置")
	}
	if cfg.ApiV3Key == "" {
		return gerror.New("微信支付 API v3 密钥未配置")
	}
	if len([]byte(cfg.ApiV3Key)) != 32 {
		return gerror.New("微信支付 API v3 密钥长度必须为 32 字节")
	}
	if cfg.NotifyUrl == "" {
		return gerror.New("微信支付回调地址未配置")
	}
	if cfg.PrivateKey == "" && cfg.PrivateKeyPath == "" {
		return gerror.New("微信支付商户私钥未配置")
	}
	if cfg.PlatformPublicKey == "" && cfg.PlatformPublicKeyPath == "" {
		return gerror.New("微信支付平台公钥未配置")
	}
	if cfg.PlatformPublicKeyId == "" {
		return gerror.New("微信支付平台公钥 ID 未配置")
	}
	return nil
}

func appBuildWechatH5PayRequest(ctx context.Context, cfg *appWechatConfig, order *entity.TOrder) (*appWechatPayRequest, error) {
	if !cfg.H5.Enabled {
		return nil, gerror.New("微信 H5 支付未启用")
	}
	appId := cfg.H5.AppId
	if appId == "" {
		appId = cfg.Mini.AppId
	}
	if appId == "" {
		return nil, gerror.New("微信 H5 支付 AppID 未配置")
	}
	clientIp := appWechatClientIp(ctx, cfg)
	if clientIp == "" {
		return nil, gerror.New("微信 H5 支付终端 IP 未获取到")
	}

	expireAt := appWechatPrepayExpireTime(ctx, cfg, order)
	prepayReq := h5.PrepayRequest{
		Appid:       core.String(appId),
		Mchid:       core.String(cfg.MchId),
		Description: core.String(appWechatOrderDescription(order)),
		OutTradeNo:  core.String(order.OrderSn),
		TimeExpire:  &expireAt,
		NotifyUrl:   core.String(cfg.NotifyUrl),
		Amount: &h5.Amount{
			Total:    core.Int64(appWechatAmountFen(order.TotalAmount)),
			Currency: core.String("CNY"),
		},
		SceneInfo: &h5.SceneInfo{
			PayerClientIp: core.String(clientIp),
			H5Info: &h5.H5Info{
				Type:    core.String("Wap"),
				AppName: appStringPtr(appWechatH5AppName(cfg)),
				AppUrl:  appStringPtr(cfg.H5.AppUrl),
			},
		},
	}

	client, err := appWechatClient(ctx, cfg)
	if err != nil {
		return nil, err
	}
	rsp, _, err := (&h5.H5ApiService{Client: client}).Prepay(ctx, prepayReq)
	if err != nil {
		return nil, gerror.Wrap(err, "微信 H5 支付预下单失败")
	}
	if rsp == nil || rsp.H5Url == nil || strings.TrimSpace(*rsp.H5Url) == "" {
		return nil, gerror.New("微信 H5 支付未返回 h5_url")
	}
	return &appWechatPayRequest{
		PayUrl:    appWechatH5PayUrl(strings.TrimSpace(*rsp.H5Url), cfg, order),
		PayMethod: appWechatPayMethodH5,
	}, nil
}

func appWechatH5PayUrl(raw string, cfg *appWechatConfig, order *entity.TOrder) string {
	raw = strings.TrimSpace(raw)
	if raw == "" || cfg == nil || order == nil || strings.TrimSpace(order.OrderSn) == "" {
		return raw
	}
	returnUrl := appWechatH5ReturnUrl(cfg, order.OrderSn)
	if returnUrl == "" {
		return raw
	}
	parsed, err := url.Parse(raw)
	if err != nil {
		return raw
	}
	query := parsed.Query()
	if strings.TrimSpace(query.Get("redirect_url")) == "" {
		query.Set("redirect_url", returnUrl)
		parsed.RawQuery = query.Encode()
	}
	return parsed.String()
}

func appWechatH5ReturnUrl(cfg *appWechatConfig, orderSn string) string {
	base := strings.TrimRight(strings.TrimSpace(cfg.H5.AppUrl), "/")
	if base == "" {
		base = strings.TrimRight(strings.TrimSpace(cfg.NotifyBaseUrl), "/")
	}
	if base == "" {
		return ""
	}
	return fmt.Sprintf("%s/#/pages/business/views/balanceRecharge/index?orderSn=%s", base, url.QueryEscape(strings.TrimSpace(orderSn)))
}

func appBuildWechatMiniPayRequest(ctx context.Context, cfg *appWechatConfig, order *entity.TOrder, user *entity.SysUser) (*appWechatPayRequest, error) {
	if !cfg.Mini.Enabled {
		return nil, gerror.New("微信小程序支付未启用")
	}
	if cfg.Mini.AppId == "" {
		return nil, gerror.New("微信小程序支付 AppID 未配置")
	}
	openId, err := appCurrentWechatOpenId(ctx, user)
	if err != nil {
		return nil, err
	}

	expireAt := appWechatPrepayExpireTime(ctx, cfg, order)
	prepayReq := jsapi.PrepayRequest{
		Appid:       core.String(cfg.Mini.AppId),
		Mchid:       core.String(cfg.MchId),
		Description: core.String(appWechatOrderDescription(order)),
		OutTradeNo:  core.String(order.OrderSn),
		TimeExpire:  &expireAt,
		NotifyUrl:   core.String(cfg.NotifyUrl),
		Amount: &jsapi.Amount{
			Total:    core.Int64(appWechatAmountFen(order.TotalAmount)),
			Currency: core.String("CNY"),
		},
		Payer: &jsapi.Payer{
			Openid: core.String(openId),
		},
	}

	client, err := appWechatClient(ctx, cfg)
	if err != nil {
		return nil, err
	}
	rsp, _, err := (&jsapi.JsapiApiService{Client: client}).PrepayWithRequestPayment(ctx, prepayReq)
	if err != nil {
		return nil, gerror.Wrap(err, "微信小程序支付预下单失败")
	}
	if rsp == nil || rsp.Package == nil || strings.TrimSpace(*rsp.Package) == "" {
		return nil, gerror.New("微信小程序支付未返回调起支付参数")
	}
	return &appWechatPayRequest{
		PayMethod: appWechatPayMethodMini,
		PayParams: map[string]string{
			"appId":     appStringValue(rsp.Appid),
			"timeStamp": appStringValue(rsp.TimeStamp),
			"nonceStr":  appStringValue(rsp.NonceStr),
			"package":   appStringValue(rsp.Package),
			"signType":  appStringValue(rsp.SignType),
			"paySign":   appStringValue(rsp.PaySign),
		},
	}, nil
}

func appWechatClient(ctx context.Context, cfg *appWechatConfig) (*core.Client, error) {
	privateKey, err := appWechatPrivateKey(cfg)
	if err != nil {
		return nil, err
	}
	verifier, err := appWechatVerifier(cfg)
	if err != nil {
		return nil, err
	}
	client, err := core.NewClient(ctx,
		option.WithMerchantCredential(cfg.MchId, cfg.MchSerialNo, privateKey),
		option.WithVerifier(verifier),
	)
	if err != nil {
		return nil, gerror.Wrap(err, "初始化微信支付 SDK 客户端失败")
	}
	return client, nil
}

func appWechatVerifier(cfg *appWechatConfig) (auth.Verifier, error) {
	publicKey, err := appWechatPlatformPublicKey(cfg)
	if err != nil {
		return nil, err
	}
	return verifiers.NewSHA256WithRSAPubkeyVerifier(cfg.PlatformPublicKeyId, *publicKey), nil
}

func appCurrentWechatOpenId(ctx context.Context, user *entity.SysUser) (string, error) {
	if user == nil || user.UserId <= 0 {
		return "", gerror.New("当前用户信息不完整，无法发起微信小程序支付")
	}
	var social *entity.SysSocial
	if err := dao.SysSocial.Ctx(ctx).
		Where(dao.SysSocial.Columns().TenantId, user.TenantId).
		Where(dao.SysSocial.Columns().UserId, user.UserId).
		Where(dao.SysSocial.Columns().Source, consts.SourceWechatMp).
		OrderDesc(dao.SysSocial.Columns().Id).
		Limit(1).
		Scan(&social); err != nil {
		return "", gerror.Wrap(err, "查询微信 openid 失败")
	}
	if social == nil || strings.TrimSpace(social.OpenId) == "" {
		return "", gerror.New("当前账号未绑定微信 openid，无法发起小程序支付")
	}
	return strings.TrimSpace(social.OpenId), nil
}

func (s *sAppCard) BalanceRechargeWechatNotify(ctx context.Context) error {
	r := g.RequestFromCtx(ctx)
	if r == nil || r.Request == nil {
		return gerror.New("微信支付通知请求不存在")
	}
	cfg, err := appLoadWechatConfig(ctx)
	if err != nil {
		return err
	}
	if !cfg.Enabled {
		return gerror.New("微信支付未启用")
	}
	if err = appValidateWechatCommonConfig(cfg); err != nil {
		return err
	}
	verifier, err := appWechatVerifier(cfg)
	if err != nil {
		return err
	}

	handler := notify.NewNotifyHandler(cfg.ApiV3Key, verifier)
	transaction := new(payments.Transaction)
	notifyReq, err := handler.ParseNotifyRequest(ctx, r.Request, transaction)
	if err != nil {
		return gerror.Wrap(err, "解析微信支付通知失败")
	}

	tradeState := appStringValue(transaction.TradeState)
	outTradeNo := appStringValue(transaction.OutTradeNo)
	transactionId := appStringValue(transaction.TransactionId)
	eventType := ""
	if notifyReq != nil {
		eventType = notifyReq.EventType
	}
	if notifyReq == nil || eventType != "TRANSACTION.SUCCESS" || tradeState != "SUCCESS" {
		g.Log().Infof(ctx, "微信支付余额充值通知忽略非成功状态: order=%s event=%s status=%s", outTradeNo, eventType, tradeState)
		return nil
	}
	if outTradeNo == "" {
		return gerror.New("微信支付通知订单号为空")
	}
	g.Log().Infof(ctx, "微信支付余额充值通知开始处理: order=%s event=%s status=%s tradeNo=%s", outTradeNo, eventType, tradeState, transactionId)

	paidAt := appParseWechatPayTime(appStringValue(transaction.SuccessTime))
	if paidAt == nil {
		paidAt = gtime.Now()
	}
	amountFen := appWechatTransactionAmountFen(transaction)
	if amountFen <= 0 {
		return gerror.New("微信支付通知金额不正确")
	}
	_, err = s.completeAppBalanceRechargePayment(
		ctx,
		outTradeNo,
		nil,
		transactionId,
		"wechat",
		consts.BalanceTransactionChannelWechat,
		float64(amountFen)/100,
		paidAt,
	)
	if err != nil {
		return err
	}
	g.Log().Infof(ctx, "微信支付余额充值通知处理成功: order=%s tradeNo=%s amountFen=%d", outTradeNo, transactionId, amountFen)
	return nil
}

func (s *sAppCard) BalanceRechargeWechatRefundNotify(ctx context.Context) error {
	r := g.RequestFromCtx(ctx)
	if r == nil || r.Request == nil {
		return gerror.New("微信退款通知请求不存在")
	}
	cfg, err := appLoadWechatConfig(ctx)
	if err != nil {
		return err
	}
	if !cfg.Enabled {
		return gerror.New("微信支付未启用")
	}
	if err = appValidateWechatCommonConfig(cfg); err != nil {
		return err
	}
	verifier, err := appWechatVerifier(cfg)
	if err != nil {
		return err
	}

	handler := notify.NewNotifyHandler(cfg.ApiV3Key, verifier)
	refund := new(refunddomestic.Refund)
	notifyReq, err := handler.ParseNotifyRequest(ctx, r.Request, refund)
	if err != nil {
		return gerror.Wrap(err, "解析微信退款通知失败")
	}

	eventType := ""
	summary := ""
	if notifyReq != nil {
		eventType = notifyReq.EventType
		summary = notifyReq.Summary
	}
	refundStatus := ""
	refundStatus = appWechatRefundStatus(refund)
	refundAmountFen := appWechatRefundAmountFen(refund)

	g.Log().Infof(
		ctx,
		"微信退款通知已验签: event=%s status=%s order=%s refundNo=%s refundId=%s amountFen=%d summary=%s",
		eventType,
		refundStatus,
		appStringValue(refund.OutTradeNo),
		appStringValue(refund.OutRefundNo),
		appStringValue(refund.RefundId),
		refundAmountFen,
		summary,
	)
	return s.applyAppBalanceRechargeRefundNotify(ctx, refund)
}

func appWechatTransactionAmountFen(transaction *payments.Transaction) int64 {
	if transaction == nil || transaction.Amount == nil {
		return 0
	}
	if transaction.Amount.PayerTotal != nil && *transaction.Amount.PayerTotal > 0 {
		return *transaction.Amount.PayerTotal
	}
	if transaction.Amount.Total != nil && *transaction.Amount.Total > 0 {
		return *transaction.Amount.Total
	}
	return 0
}

func appWechatPrivateKey(cfg *appWechatConfig) (*rsa.PrivateKey, error) {
	raw, err := appWechatKeyContent(cfg.PrivateKey, cfg.PrivateKeyPath)
	if err != nil {
		return nil, gerror.Wrap(err, "读取微信支付商户私钥失败")
	}
	der, err := appWechatDecodeKey(raw)
	if err != nil {
		return nil, gerror.Wrap(err, "解析微信支付商户私钥失败")
	}
	if key, err := x509.ParsePKCS8PrivateKey(der); err == nil {
		if privateKey, ok := key.(*rsa.PrivateKey); ok {
			return privateKey, nil
		}
	}
	if privateKey, err := x509.ParsePKCS1PrivateKey(der); err == nil {
		return privateKey, nil
	}
	return nil, gerror.New("微信支付商户私钥不是有效 RSA 私钥")
}

func appWechatPlatformPublicKey(cfg *appWechatConfig) (*rsa.PublicKey, error) {
	raw, err := appWechatKeyContent(cfg.PlatformPublicKey, cfg.PlatformPublicKeyPath)
	if err != nil {
		return nil, gerror.Wrap(err, "读取微信支付平台公钥失败")
	}
	der, err := appWechatDecodeKey(raw)
	if err != nil {
		return nil, gerror.Wrap(err, "解析微信支付平台公钥失败")
	}
	if key, err := x509.ParsePKIXPublicKey(der); err == nil {
		if publicKey, ok := key.(*rsa.PublicKey); ok {
			return publicKey, nil
		}
	}
	if publicKey, err := x509.ParsePKCS1PublicKey(der); err == nil {
		return publicKey, nil
	}
	return nil, gerror.New("微信支付平台公钥不是有效 RSA 公钥")
}

func appWechatKeyContent(raw string, path string) (string, error) {
	if strings.TrimSpace(raw) != "" {
		return strings.TrimSpace(raw), nil
	}
	if strings.TrimSpace(path) == "" {
		return "", gerror.New("密钥路径未配置")
	}
	content, err := os.ReadFile(path)
	if err != nil {
		return "", err
	}
	return string(content), nil
}

func appWechatDecodeKey(raw string) ([]byte, error) {
	raw = strings.TrimSpace(raw)
	if raw == "" {
		return nil, gerror.New("密钥内容为空")
	}
	if block, _ := pem.Decode([]byte(raw)); block != nil {
		return block.Bytes, nil
	}
	compact := strings.Join(strings.Fields(raw), "")
	der, err := base64.StdEncoding.DecodeString(compact)
	if err != nil {
		return nil, err
	}
	return der, nil
}

func appNormalizeWechatPayScene(payScene string) string {
	switch strings.ToLower(strings.TrimSpace(payScene)) {
	case "mini", "mp", "mp-weixin", "wechat_mini", "miniprogram":
		return "mini"
	default:
		return "h5"
	}
}

func appWechatAmountFen(amount float64) int64 {
	return int64(math.Round(appRoundAmount(amount) * 100))
}

func appWechatClientIp(ctx context.Context, cfg *appWechatConfig) string {
	clientIp := strings.TrimSpace(cfg.H5.PayerClientIp)
	if clientIp == "" {
		if r := g.RequestFromCtx(ctx); r != nil {
			clientIp = strings.TrimSpace(r.GetClientIp())
		}
	}
	if parsed := net.ParseIP(clientIp); parsed != nil {
		return parsed.String()
	}
	return clientIp
}

func appWechatOrderDescription(order *entity.TOrder) string {
	amount := appFormatMoney(order.TotalAmount)
	return fmt.Sprintf("余额充值 %s", amount)
}

func appWechatH5AppName(cfg *appWechatConfig) string {
	if cfg.H5.AppName != "" {
		return cfg.H5.AppName
	}
	return "示例企业"
}

func appParseWechatPayTime(value string) *gtime.Time {
	value = strings.TrimSpace(value)
	if value == "" {
		return nil
	}
	parsed, err := time.Parse(time.RFC3339, value)
	if err != nil {
		return nil
	}
	return gtime.NewFromTime(parsed)
}

func appStringPtr(value string) *string {
	value = strings.TrimSpace(value)
	if value == "" {
		return nil
	}
	return core.String(value)
}

func appStringValue(value *string) string {
	if value == nil {
		return ""
	}
	return strings.TrimSpace(*value)
}